ima_calc_file_hash

函数名称：ima_calc_file_hash_tfm

函数原型：static int ima_calc_file_hash_tfm(struct file *file, struct ima_digest_data *hash, struct crypto_shash *tfm)

返回类型：int

参数：

类型	参数	名称
struct file *	file
struct ima_digest_data *	hash
struct crypto_shash *	tfm

335

offset等于0

338

SHASH_DESC_ON_STACK(shash, tfm)

340

tfm等于tfm

342

length等于获得消息文摘大小

344

rc等于rypto_shash_init() - (re)initialize message digest*@desc: operational state handle that is already filled* The call (re-)initializes the message digest referenced by the* operational state handle. Any potentially existing state created by

345

如果rc不等于0则返回:rc

348

i_size等于NOTE: in a 32bit arch with a preemptable kernel and* an UP compile the i_size_read/write must be atomic* with respect to the local cpu (unlike with preempt disabled),* but they don't need to be atomic with respect to other cpus like in* true SMP (so they

350

如果i_size恒等于0则转到:out

353

rbuf等于分配内存并置零

354

如果非rbuf则返回:负ENOMEM

357

当offset小于i_size 循环

360

rbuf_len等于grity_kernel_read - read data from the file* This is a function for reading file content instead of kernel_read().* It does not perform locking checks to ensure it cannot be blocked.* It does not perform security checks because it is irrelevant for IMA.

361

如果rbuf_len小于0则

362

rc等于rbuf_len

363

退出

365

如果rbuf_len恒等于0则退出

367

offset加等于rbuf_len

369

rc等于rypto_shash_update() - add data to message digest for processing*@desc: operational state handle that is already initialized*@data: input data to be added to the message digest*@len: length of the input data

370

如果rc则退出

373

释放内存

374

out :

375

如果非rc则rc等于rypto_shash_final() - calculate message digest*@desc: operational state handle that is already filled with data*@out: output buffer filled with the message digest* Finalize the message digest operation and create the message digest

377

返回:rc

**调用者**
名称	描述
ima_calc_file_shash

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码

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